CN1647431A

CN1647431A - Low correlative/zero correlative spectrum spreading code set encoding and using method

Info

Publication number: CN1647431A
Application number: CN03807994.1A
Authority: CN
Inventors: 徐绍君; 高岩; 拉盖施·塔玛拉卡
Original assignee: Linkair Communications Inc
Current assignee: Linkair Communications Inc
Priority date: 2003-02-26
Filing date: 2003-02-26
Publication date: 2005-07-27
Also published as: AU2003211674A1; WO2004077714A1

Abstract

This invention relates to a low correlative code/zero correlative spreading code set encode and its use. All the NK spreading codes are divided into N sets. Each set has K spreading codes. Division of sets meets following condition, i.e., low correlative or zero correlative exist between them. It can be used to inhibit effectively interferes by channel distribution and power distribution and network grouping, and to induce ACI, so as to increase capacity of system.

Description

Low correlative/zero correlative spectrum spreading code set encoding and using method

A kind of low phase pass/zero correlation spreading code set coding and application process

Technical field

The invention belongs to wireless communication technology field, its more particularly to cdma wireless communication system, is concretely a kind of low phase pass/zero correlation spreading code set coding and application process.

Background technology

Continuous popularization and relatively deficient, requirement more and more higher of the people to radio communication intermediate frequency spectrum utilization rate of radio spectrum resources with PCS.Traditional access way, such as FDMA (frequency division multiple access）, TDMA (time division multiple acesses）, because its poorly efficient availability of frequency spectrum can not increasingly meet the demand of growing Modern wireless communication.New access way CDMA (CDMAs）, because it has the higher availability of frequency spectrum, it has been acknowledged as the main access way in next generation wireless communication.

The beautiful A of C are with other access way differences：Cdma system is a soft capacity, and its capacity depends on the interference level of system, and any means that can reduce interference can increase the capacity of cdma system.And other access ways such as FDMA, TDMA system capacity are a hard capacity, its capacity just has determined after system foundation.

Because cdma system capacity depends on the interference level of system, how interference in reduction system is most important for C hides A systems.Interference in CDMA systems mainly has three kinds：One is intersymbol interference（ISI), two be multi-access inference（MAI), three be adjacent cell interference（ACI ).For intersymbol interference mainly due to spread spectrum code word undesirable auto-correlation cause, multi-access inference mainly due to

It is caused.Design a kind of spread spectrum code character with good auto-correlation and good cross correlation most important for CDMA systems.Preferable auto-correlation refers to that the auto-correlation function for spreading code word is zero everywhere in all time migrations in addition to origin, and it is zero everywhere that preferable cross-correlation, which refers to spread cross-correlation function between code word in all time migrations,.But according to Welch circle, auto-correlation function and cross-correlation function are conflicts, reduce one and necessarily cause another increase, so preferably code word is non-existent completely simultaneously for auto-correlation function and cross-correlation function. In traditional CDMA systems, frequency expansion sequence uses common orthogonal sequence.Such as in IS -95, frequency expansion sequence uses Wal sh sequences, this code word only at the origin keeps orthogonal, correlation outside origin is not zero, because mobile channel is a multipath channel, in this channel, the system of this yard will necessarily introduce ISI and MAI, and the capacity of this system can not be blunt; L

In addition to WALSH codes, some systems additionally use GOLD codes.GOLD codes are a kind of non-orthogonal codes, but have more preferable submaximum with WALSH code-phases ratio（Correlation function beyond origin）Characteristic.Limited by WELCH circle, the submaximum of GOLD codes is still than larger.So being still an interference limiting system using the cdma system of GOLD codes. .

Inventor's Li Daoben proposes a kind of complementary zero correlation window code of new spreading code one, LS ' codes in Application No. PCT/CN00/00028 application for a patent for invention.Assuming that the maximum time diffusing capacity of channel is Δ, this code word ensures that the correlation properties in [- Δ, Δ] are preferable.ISI and Μ Α Ι are eliminated using the system of this code word, the capacity of system is greatly increased, the system of code is referred to as LAS-cdma system using this code word as core address.

Whether WALSH codes, GOLD codes or LS codes, solution is all how to reduce or eliminate the ISI and MAI of CDMA systems, i.e., single cell operation the problem of.In cell mobile communication systems, we also need solve how multiple cell/many sectors cooperation the problem of, i.e., how to solve from adjacent cell/neighbour's sector interference the problem of.

Above-mentioned WALSH codes, GOLD codes and code are referred to as short spreading code（ShortCode) .In IS -95 and other traditional CDMA systems, using long pseudorandom（PN) sequence pair short spreading code entersHorse (scrambling).In same cell, ^ T frequency codes (WALSH codes or GOLD codes are utilized）To distinguish different channels, referred to as channel code, different cells carry out scrambler, referred to as long code using different long PN sequences.In fact, this scrambler mode can not reduce the interference of system, and the interference for being simply subject to user is more homogenized, and the user in such guarantee system has identical communication quality.

In LAS-cdma system, the mode for using+LS yards of LA codes carries out cell networking.LA codes are a kind of multiple-pulse long codes of particular design, and LA code book bodies have good correlation properties, and correlation properties have a ^ [blunt big zero correlation window.LS codes are then inserted into each pulse of LA codes as short code In.Different channels, referred to as channel code are so distinguished using LS codes in same cell, and different cells is then distinguished using different LA codes.Because LA codes have good cross correlation, so LAS-C abdomen A systems can be with the blunt interference for suppressing adjacent cell well.

In LAS-CDMA systems, due to interference being not present between the user of same cell, so in the downlink, the user of diverse location can carry out effective power distribution：The user remote apart from base station distributes larger transmission power, and the user near apart from base station distributes less transmission power, finally makes all with holding identical wanted to interfering signal ratio level per family in cell.So the transmission power of base station can be reduced about 3-5dB, while also by the-5dB of the adjacent cell interference drop ^ third constellations 3.And in traditional CDMA systems, due to there is interference between the user of same cell, so in the downlink, it is impossible to implement effective power distribution, otherwise powerful user is by the low power user of severe jamming.

In addition to above-mentioned various reduction perturbation techniques, also a kind of important technology is exactly dynamic channel allocation (Dynamic Channel Al locat ion).The thought of dynamic channel allocation is such：Interferometry is carried out to the channel residing for user and other idle channels using e measurement technology, if a user is in serious disturbance state, and the interference now suffered by idle channel elsewhere is relatively small, it is possible to which this user is switched on this idle channel by consideration.Dynamic channel allocation can reduce the interference of cdma system to a certain extent, but its effect is limited, and the problem of can also have certain in the implementation.The primary limitation of dynamic channel allocation is：（1), interference of the dynamic channel allocation for reducing system is very limited amount of, particularly when close to full user job, now remaining idle channel is few, when a user is by severe jamming, can not find a more preferable idle channel can switch, and now dynamic channel allocation has lost its effect.(2), dynamic channel allocation algorithm needs a set of complicated Measurement Algorithm, allocation algorithm and control algolithm, so by the complexity for the system that considerably increases.（3), dynamic channel allocation algorithm requires that user needs frequently to be switched in communication process, this not only considerably increases the complexity of system, substantial amounts of control instruction is also required to simultaneously, substantial amounts of system resource is so taken, cause huge waste.

1998, K. Hamidian and L Payne delivered a paper " Frequency reuse appl ied to CDMA channels in a cel lular sys tem " jointly.In this paper In refer to a kind of a kind of new beehive net mode-F Should A/CDMA carried out in traditional CDMA systems.This new networking mode can be briefly described as follows：First by it is each it is small be distinguished into annular domain, they are respectively labeled as by we： A A₂... ..., k_N.In same cell, different frequencies is used in the user of different rings, it is labeled as by we： , f₂... ..., f_N, and power distribution is carried out between different rings, less transmission power for example is distributed in the user in the closer ring in base station, and in the larger transmission power of user's distribution ratio in the distant ring in base station.And between adjacent cell, using different frequency permutations, to ensure that the outer shroud user of neighbor cell possesses different frequencies, the so user in each cell boarder, it is not disturbed by neighbor cell outer shroud user（And it is launched with relatively high power transmission power）, only disturbed by neighbor cell inner ring user（And it is launched with smaller transmission power）, the ACI of boundary user can be thus reduced, and apart from the closer user in base station, due to the attenuation factor of distance, the interference suffered by it is relatively small.Such system can substantially reduce the ACI of system.A simply example is lifted to illustrate this method：Assuming that we by it is each it is small be distinguished into three concentric rings, from the inside to the outside labeled as A_p A₂ , A₃.One has three frequencies： f , f₂, ί .We only consider the cylinder one-state of three cells, and more cells can be analogized.Assuming that the frequency in first cell is pressed from inner ring to outer shroud ,/₂, ₃Sequence arrangement, the frequency in second cell presses from inner ring to outer shroud₂, f₃, f sequence arrangement, frequency in the 3rd cell from inner ring to outer shroud by/₃, f , f₂Sequence arrangement, interference has been not present between user since so in the identical ring of neighbor cell, only disturbed for the user of outer shroud by the first ring from neighbor cell or the second ring user, and due to the presence of power distribution, the transmission power of the user of first ring and the second ring hands over small, thus the adjacent cell suffered by sunset Bu Huan user it is dry take ^ d ^ by force and inner ring user due between the user of different districts there is different path attenuation can also obtain good performance.

K. the FDMA/CDMA cell networkings scheme that Hamidian is proposed can efficiently solve adjacent cell interference problem, but since being proposed from the program, enough attention have not been obtained.Mainly due in traditional cdma system in addition to it there is ACI, and also there is serious ISI and MAI between the user in same cell, even if the problem of therefore efficiently solving ACI, the problem of ISI and MAI, solves again without method, the capacity of system is still to be limited by ISI and MAI, so system Capacity can only obtain the raising of very little.In the downlink, the capacity of FDMA/CDMA systems probably improves 1/7 than traditional CDMA systems, and in the uplink, the capacity of FDMA/CDMA systems probably improves 5. 8-20% than traditional cdma system.In view of the overhead and system complexity of system, do not have that what very big advantage can be sayed using FDMA/CDMA.

The content of the invention is present invention aims at a kind of low phase pass/zero correlation spreading code set coding and application process is provided, wherein described low phase pass/zero correlation spreading code set coding method can be briefly described as follows：The shared spreading code of an ancient weapon made of bamboo one, is then grouped to this spreading code according to certain rule, is divided into a different code collection, we are marked as SET, SET, SET_N, wherein containing spreading code in each code collection, we are marked as CODE ... ... C0DE_K.This is by the code collection:Individual spreading code can be expressed as CODE.The criterion being wherein grouped is as follows：Have the cross-correlation function between the spreading code of good cross correlation, i.e. any two from different code collections around origin than keeping good correlation properties in larger time migration between individual code collection after packet（Low phase is closed or zero correlation）.And to the code in same code collection then without excessive requirement, it can be an orthogonal code collection or a mesh closes window code collection, it might even be possible to be a nonopiate code collection.

The application process of described low phase pass/zero correlation spreading code set can effectively suppress the interference from adjacent cell and the interference from adjacent sector by channel distribution, power distribution and cell/section networking etc., and ACI can be substantially reduced, greatly improved power system capacity.

The technical scheme is that：

A kind of low phase pass/zero correlation spreading code set coding method, it is characterised in that：If one shared spreading code, is grouped to NK described spreading code, it is divided into V code collection, each code collection containing f spreading code；

Wherein described packet meets following condition：There is low phase pass/zero correlation characteristic between individual code collection after packet.Between individual code collection after described packet there is low phase pass/zero correlation characteristic to refer to：Cross-correlation function between spreading code of any two from different code collections is around origin than in larger time migration Keep low phase pass/zero correlation characteristic；And the code in same code collection can be：One orthogonal code collection, or a zero correlation window code collection, or a nonopiate code collection.

A kind of described low phase pass/zero correlation spreading code set coding method Bao includes Yi Xia Bu Sudden：

Step 1: setting in the presence of a spread spectrum code word, wherein N can take arbitrary positive integer, and packet will be carried out on this basis；

Step 2: being grouped to individual spreading code, be divided into the individual code collection of formed objects, be respectively labeled as SET, S T₂The each code collections of SET have f code word, and Qi Fen Do are labeled as into CODE^ C0DE₁ C0DE_K, the code word being so in the 2nd code collection can just be expressed as, SET_n, C0DE_k

Step 3: packet is carried out according to following condition：Packet make to have between different code collections in time migration very big around origin closed for low phase or zero correlation correlation properties, there are the correlation properties of low phase pass or zero correlation between i.e. any two codes from different code collections, and the code in same code collection can be orthogonal sequence, can also be zero correlation window sequence or non-orthogonal sequences；

Step 4: by the above the step of obtained containing code word in individual code collection, each code collection;Described above is the individual code collection for obtaining formed objects, naturally it is also possible to be divided into a code collection of different sizes, but generally use be all formed objects code collection, be all such case in the following description.

An any given above-mentioned spread spectrum code word of fainting, requires that it is not an easily thing that spreading code is divided into a group according to requirement above according to above-mentioned packet.But we can but construct above-mentioned low phase pass/zero correlation spreading code set by specific make.The invention provides the make of low phase pass/zero correlation spreading code set, the similar make such as domain construction when described make includes, frequency domain construction, code domain construction, time-frequency combination construction, time-code combined structure, frequency code combined structure and time-frequency code combined structure.

Code domain is constructed：Pass through special coding method, a different code collection is distinguished from code domain, so that having good cross correlation between individual code collection, the low phase pass/zero correlation spreading code set distinguished below in code domain is referred to as code division low phase pass/zero correlation spreading code set. Code domain construction comprises the following steps：

(1) a generalized complementary code with a complementary portion incoherent two-by-two, is constructed, the length of each complementary portion is L.(specific building method may refer to document [1,2,5]).

Individual length is Z code word S_L5 S₂..., S, except zero point, if the auto-correlation sum of individual code word is all zero on being offset, claims code word（S_L5 S₂..., S is the generalized complementary code with individual complementary portion.

If two generalized complementary codes with a complementary portion： (S s₂.., s), (s, s₂ ², s), if the cross-correlation sum of individual complementary portion therebetween is zero in all time migrations, claim the two generalized complementaries code uncorrelated.

For the generalized complementary code with individual complementary portion, there is following conclusion to set up：At most there are the N incoherent generalized complementary codes with a complementary portion two-by-two.（Referring to document [1,2,5]) this generalized complementary code is denoted as by we：（S, s₂..., s), (S, S₂ ².., S ..., when N=2, above-mentioned code word is the mutual-complementing code often said, now at most there are two mutual incoherent complementary code words.Work as N>When 2, above-mentioned code word is referred to as generalized complementary code, now at most there is a generalized complementary code incoherent two-by-two.

When each complementary portion length 1=for special case situation, the matrix that now individual generalized complementary code is constituted is actually orthogonal matrix, i.e. a matrix A:

Work as N, Z takes smaller value, # generalized complementary code can be obtained by Computer Simulation search, works as N, when taking than larger value, can be obtained by certain building method（Referring to document

[1,2,5] )。

(2) χ Γ orthogonal matrix H, is chosen

(3), had been obtained for by two above step individual incoherent with a complementary portion two-by-two The generalized complementary code divided： (s^, s₂..., s), (s, s₂ ², s) ... ..., (s, s,

S), code length is Z and Γ χ orthogonal matrix H^^.Carried out for each generalized complementary code using orthogonal matrix containing a spread spectrum code word in the spreading code set of the available extension of Kronecker extensions, the spreading code set, specific extended mode is as follows：

SET = μ_ΚχΚ 05/, n_KxK ®s\ - n_KxK ®s_N ^l )

SET₂ = (u_KxK ®s Ή_ΚχΚ ®sl - n_KxK ® )

ns h_l2S ... s wherein ' (' represent operation Kronecker operations, such as： H^®S = 1^S ½^S "· ^!l2K^S ^hKl^{S h}K2^S ··· ^hKK^SFor the spreading code set SET of each extension_n, 1 n N, its ^ " " rows represent the code word of an extension, then each extended code is concentrated containing a spread spectrum code word, and each spread spectrum code word has a complementary portion, and the length of each complementary portion, which is changed into the individual spreading code set that KL obtains, has following property：

(a), there is the zero correlation window of [-+1, Z- 1] for K spread spectrum code word in each spreading code set, i.e., there is preferable auto-correlation and cross-correlation in [- Z+1, -1] interior Γ spread spectrum code word.If=1, the individual spread spectrum code word in each code collection after extension only keeps orthogonal.

(b), for different spreading code sets, in all time migrations, there is zero correlation characteristic between the code in two code collections.Cross-correlation i.e. between code of [-+1, -1] the interior any two from different code collections is zero.

(4) spreading code set, has been obtained by three above step, each code collection has f spreading code.Wherein coming from has zero correlation characteristic between the code word of different code collections, and to the code word inside code collection can be zero correlation window code word or general orthogonal code.The individual spreading code of above-mentioned generation is the generalized complementary code with a complementary portion, carries out requiring a complementary portion difference computing during correlation computations, it is impossible to overlapping.So in practice, individual complementary portion should be transmitted in the channel of N synchronous fading.Individual complementary portion can be placed in a time slot and send by we, and protection interval is inserted between adjacent time-slots.The efficiency so done may not be very high.We can also be by middle guarantor Shield interval is cancelled, although so losing zero correlation characteristic between code collection, but still keeps low correlated characteristic.When domain construction：Individual different code collection is made a distinction from time domain, the spreading code set thus generated is referred to as time-division low phase pass/zero correlation spreading code set.When domain structuring approach comprise the following steps：

(1), assume there be f spread spectrum code word, this spread spectrum code word can be zero correlation window code or general orthogonal code, it might even be possible to be non-orthogonal code.

(2) it is a different time slot, to ram a frame length, and the width of each time slot is that insertion protection interval width is Δ between T, time slot, as shown in Figure 1.

(3) it is, a different spreading code set by frequency spreading code division according to time slot, the time slot represents the spreading code set, and all spreading codes are now sent in the time slot, and does not send anything then in other time slots.At this moment the individual spreading code set constructed is as shown in Figure 2：

(4) the individual spreading code set, divided as shown in Fig. 2, time migration is in [- Δ, Δ] in, cross-correlation between two different spreading code sets is zero, even if time migration exceedes Δ, if the lap of two time slots is not very big, two different spreading code sets remain in that low correlated characteristic.

(5), several steps have obtained the spreading code set of N number of low phase pass/zero correlation more than, and each spreading code set has Γ spreading code.

When domain construction compared to code domain construction have some advantages：（The code word that domain structuring approach is constructed when a), has higher efficiency compared to code domain building method; because if the time width of the occupancy of each time slot is than larger; the time width of middle protection Time Slot Occupancy is relative just smaller, so with higher efficiency of transmission.And for code domain building method, it is required to insert protection interval in the middle of individual complementary portion, it is necessary to sacrifice more resources；（B), when domain structuring approach compared to code domain building method it is simpler plus, it is more flexible, for any if spreading code, we can assign it to a different time slot to obtain a 4Shi correlations/zero correlation spreading code set, for being readily obtained for arbitrary integer all 4 is blunt, and for code domain building method just without so easy, for example when for odd number, a generalized complementary code with a complementary portion incoherent two-by-two can not be just found in two element field, so profit can not just be constructed with the aforedescribed process there emerged a low phase pass/zero correlation spreading code set.

(6) when, described above in domain construction, what individual time slot was sent is that identical is spread Code, actually when domain structuring approach in, each time slot can send different individual spreading codes, and such as different time slots can send the conversion of spreading code, entirely different individual spreading code is can even is that, the individual spreading code set being so divided into remains in that low phase pass/zero correlation characteristic.

The spreading code set of/zero correlation, the code collection thus generated is referred to as frequency division low phase pass/zero correlation spreading code set.Frequency domain building method comprises the following steps：

(1), assume there is a spread spectrum code word, be denoted as C0DE₂... ..., CODE, this Γ spread spectrum code word can be zero correlation window code or general orthogonal code, it might even be possible to be non-orthogonal code；

(2) an incoherent carrier wave, is chosen： i , f₂... ..., f_N;

(3), individual spread spectrum code word is modulated on above-mentioned individual incoherent carrier wave respectively, an incoherent spreading code set is obtained： SET f_x+ {C0DE_x, C0D ₂... ..., C0DE, SET₂： f^ iCODE,, C0DE₂... ..., CODECS, SET_h: f_N+ {CODE^ C0DE₂, …… , C0DE_k}

(4), obtained having individual spreading code in an incoherent spreading code set, each code collection by above step.Frequency division low phase pass/zero correlation spreading code set has advantages below：(a) it is modulated at due to individual spreading code set on different carrier waves, so spreading code set different in all time migrations is respectively provided with low correlated characteristic；（B) protection time slot need not be inserted for frequency division low phase pass/zero correlation spreading code set, so its efficiency will height compared to time-division spreading code set, code division spreading code set.But it is modulated at due to different spreading code sets on different carrier waves, altogether with individual carrier wave, the problem of running into actual applications in realization.

In addition to three kinds of above-mentioned makes, present invention includes the combined structure mode of three of the above make：Including time-frequency combination construction, time-code combined structure, frequency code combined structure and time-frequency code combined structure mode.

Constructed during code：Be by above-mentioned code domain construction with when domain construction combined, common generation group low phase pass/zero correlation spreading code set.Construction comprises the following steps during the code that the present invention is provided：

(1) the ^ spread spectrums with low phase pass/zero correlation, are constructed using above-mentioned code domain building method Code collection, is respectively labeled as A_l5A₂, .···.· , A_NI, wherein containing a spreading code in each spreading code set.(2), regard ^ above-mentioned spreading code set as an entirety, with reference to foregoing when domain structuring approach, be individually placed to send in ^ time slot, can so obtain=^><₂Individual low phase pass/zero correlation spreading code set, this spreading code set is not to be：

SET k_xThe Γ of+time slot 1₂:A+time slot 2 ... SET_Ni：Aj+time slot

SET_N2+X： A₂The SET of+time slot 1_N2+2： A₂+ time slot 2 ... SET_2NI： A₂+ time slot N₂

SET_MNI+LThe SET of A+time slot 1_MNI+2：+ time slot 2 ... SET_NXNAw ,+time slot N₂

(3) a low phase pass/zero correlation spreading code set, is obtained by Bu Sudden above, wherein each spreading code set includes Γ spreading code.

Time-frequency is constructed：It is that domain construction is constructed with frequency domain and combined when will be above-mentioned, common generation group low phase pass/zero correlation spreading code set.Construction comprises the following steps during the code that the present invention is provided：

(1), provided with a spreading code set, including individual spreading code, it is designated as A

(2) above-mentioned spreading code set, is modulated to ^ incoherent carrier wave/^. of Λ, on, ^ incoherent spreading code sets are obtained, are respectively： Α^Α + ΖΙ, Α₂ =Α + /₂... ..., A_N] =A + f_Ni

(3), regard above-mentioned individual spreading code set as an entirety, with reference to foregoing when domain structuring approach, be individually placed to N₂Sent in individual time slot, can so obtain Ν=Ν, χ Ν₂Individual low phase pass/zero correlation spreading code set, this spreading code set is not to be：

SET k_xThe Γ of+time slot 1₂:+ time slot 2 ... SET_Ni： A_:+ time slot

SET_N^_X： A₂The SET of+time slot 1_{N 2} A₂+ time slot 2 ... ET_2NI： A₂+ time slot W₂

^SET(N、- ： A_WiThe SET of+time slot 1_MNI+2：Aw ,+time slot 2 ... ... SET：+ time slot N₂

(4) a low phase pass/zero correlation spreading code set, is obtained by above step, wherein each spreading code set includes a spreading code.

Code frequency is constructed：It is to construct above-mentioned code domain construction with frequency domain to combine, common generation group low phase pass/zero correlation spreading code set.Construction comprises the following steps during code： (1) the Λ spreading code sets with low phase pass/zero correlation, are constructed using above-mentioned code domain building method, A is respectively labeled as₁₃A₂..., A^, wherein containing f spreading code in each spreading code set.

(2), regard ^ above-mentioned spreading code set as an entirety, with reference to foregoing frequency domain building method, it is modulated to respectively₂Send, can so obtain in individual incoherent carrier wave

Individual low phase pass/zero correlation spreading code set, this spreading code set is not to be：

SET,: k,+ f_x SET,: A,+ /₂ …… SET_N2 k, + f_Ni

SET_N^_X A₂+ _t SET_Ni+2: A₂+ /₂ …-… SET_Wi A₂ + f_Ni

(3) a low phase pass/zero correlation spreading code set, is obtained by above step, wherein each spreading code set includes f spreading code.

Time-frequency code is constructed in combination：Specific Bu Sudden are similar as the aforementioned, and cylinder is singly described as follows：For a spreading code set containing K spreading code, y is divided into from code domain, time domain, frequency domain respectively, w₂,w₃Individual low phase pass/zero correlation spreading code set, is joined together can be obtained by;ν =

Individual low phase pass/zero correlation spreading code set.

In addition to time domain mentioned above, code domain, frequency domain, other any domains that a spreading code set can be divided into multiple low phase pass/zero correlation spreading code sets may be by above-mentioned method and constitute low phase pass/zero correlation spreading code set that the present invention is provided.Invention also includes the equivalent transformation of any of above low phase pass/zero correlation spreading code set.

Present invention includes a kind of a kind of new channel distribution of low phase pass/zero correlation spreading code set application process one, power distribution and cell/section network-building method.This new channel distribution, power distribution and cell/section network-building method can effectively suppress the interference from adjacent cell and the interference from adjacent sector.This new channel distribution, power distribution and cell networking method include：

(1) a low phase pass/zero correlation spreading code set, is obtained by above-mentioned coding method；

(2) each cell, is divided into a concentric ring, the size of concentric ring can be according to actual conditions (service distribution or the convenient consideration of design etc.）Depending on； .

(3), above-mentioned each cell is divided into concentric ring is one of special case situation, in addition can also be using other division methods.A division can be such as determined according to path loss, the size being disturbed or wanted to interfering signal ratio size, individual division can even is that irregular.In addition other dividing modes be there is likely to be；

(4), obtained individual low phase pass/zero correlation spreading code set is separately dispensed on a ring, from inner ring to outer shroud, the arrangement mode of individual spreading code set is designated as Λ;

(5) power distribution, is carried out to the user of individual ring, power distribution is different in downlink and up-link.In the downlink, to follow power-balance criterion and power distribution is carried out to the user of each ring, user's path loss of outer shroud is big, distributes larger transmission power, and user's path loss of inner ring is small, distributes less transmission power.In the uplink, traditional power distribution is to follow the criterion of power-balance to carry out, that is the power of user's arrival base station is equal in synchronization, and in the present invention, it is desirable to the power that the user of inner ring reaches user's arrival base station of the power ratio outer shroud of base station is big.If carrying out more accurate power distribution, link can uniformly follow wanted to interfering signal ratio up and down（SIR) balance criterion is carried out；

(6), in neighbor cell, spreading code set is from inner ring to outer shroud, it should the arrangement mode different from this cell is used, labeled as Ρ₂, Λ, …….Under multiple cell network environment, the arrangement of the spreading code set of different districts should be carried out in accordance with following criterion：Neighbor cell outer shroud tries one's best the different spreading code set of distribution, the i.e. user of neighbor cell outer shroud as far as possible using the code word in different code collections, thus can either disturb very little so that interference to be not present between the outer shroud user of neighbor cell.

In the downlink, as a result of above-mentioned new spread spectrum code word, there are good correlation properties between code word from different code collections, so the interference very little between the user of neighbor cell outer shroud is even wholly without interference, the user of outer shroud is only disturbed by the inner ring user from neighbor cell, and transmission power of the user of inner ring itself is small, so greatly reducing adjacent cell interference for the user of outer shroud, and for the user of inner ring, it is disturbed by from neighbor cell outer shroud user, but for the user of inner ring, adjacent base station distance for this cell base station is much greater, declined by path After subtracting, disturb blunt small, so the user of inner ring in the same old way can be with normal work.In the uplink, if using traditional power distribution method, follow the power-balance criterion that user reaches base station, now the user of outer shroud distributes larger transmission power, and the user of inner ring distributes less transmission power, the power of outer shroud user and inner ring user are all equal when reaching base station by path attenuation.In such case, we analyze the interference that inner ring user and outer shroud user are subject to：For outer shroud user, the spreading code that the outer shroud user of neighbor cell uses has good correlation properties with it, so it is disturbed very little even without, the user for the simply neighbor cell inner ring disturbed it, and according to traditional power distribution criterion, the user emission power of inner ring is small, so the adjacent cell interference suffered by outer shroud user is relatively small；And for inner ring user, outer shroud user of the interference from neighbor cell suffered by it, because the transmission power of outer shroud user is larger, so ' the adjacent cell interference suffered by inner ring user is relatively large.

It can be seen that from the analysis above to up-link, if using traditional power distribution criterion, for the new channel distribution that the present invention is mentioned, producing the unbalanced phenomenon of interference, (because it uses power-balance criterion, it is uneven that interference imbalance is also equivalent to wanted to interfering signal ratio）.How this phenomenon is overcome, we introduce wanted to interfering signal ratio balance criterion in the uplink, it is easy to regard to solving this problem, that is, properly increase the transmission power of inner ring user so that the wanted to interfering signal ratio level of inner and outer ring user reaches the state of a balance.Now the transmission power of inner ring user is still smaller than outer shroud user, but difference is more much smaller than using power distribution criterion, advantage of this is that bringing substantially reducing for the dynamic range of the transmission power of uplink user, the adjacent cell interference of outer shroud user has been greatly reduced simultaneously, improves the wanted to interfering signal ratio level in up-link.

A kind of method of the user communication quality equilibrating made in cell has been found in this new channel distribution, power distribution and the cell networking method that actually the present invention is provided, that is the either user of inner ring, or the user of outer shroud can carry out proper communication.Situation about can be worked without user only near from base station；

(7), above-mentioned channel distribution and power distribution are not only practically applicable to cell networking, equally applicable for sector networking and similar networking； (8), above-mentioned channel distribution and power distribution are equally applicable in downlink, up-link；

(9), Γ spread spectrum code word in each spreading code set can also use zero correlation window sequence using orthogonal sequence, if using common orthogonal sequence such as WALSH codes etc., although reducing adjacent cell interference, but because ISI and MAI are still very big, so power system capacity is still unlikely to obtain big raising, if a spread spectrum code word uses zero correlation window sequence in each code collection, because the sequence elimination has eliminated ISI and MAI, and the channel distribution that the present invention is provided, power distribution and cell/section network-building method greatly reduce ACI again, power system capacity can be greatly improved.

According to application process of the present invention, channel distribution and described power distribution are applied to cell networking, sector networking and other similar networkings, and are applicable in the downlink；It includes step in detail below：

A) division is determined first, i.e.,：Identical power is all distributed in base station to all users, then the wanted to interfering signal ratio level of each cell or the different zones of sector is detected, each cell or sector are divided into a different parts according to the height of wanted to interfering signal ratio level, at the same can also other criterions determine that N divides；

B) individual spreading code set is assigned in a division, while ensureing the different spreading code sets of the relatively low division distribution of the wanted to interfering signal ratio of neighbor cell；

C) user in the region relatively low to wanted to interfering signal ratio distributes larger power, and the user in the higher region of wanted to interfering signal ratio distributes less power, until user's wanted to interfering signal ratio level in all regions reaches unanimously.

According to application process of the present invention, channel distribution and described power distribution method are applied to cell networking, sector networking and other similar networkings, and are applicable in the uplink；It includes step in detail below：

A) division is determined first, and method is as follows：All mobile stations all distribute identical power, then user's wanted to interfering signal ratio level of each cell or the different zones of sector is investigated, each cell or sector be divided into by the different parts of N according to the height of wanted to interfering signal ratio level, at the same can also other criterions determine N number of division；

B) individual spreading code set is assigned in a division, while ensureing that the wanted to interfering signal ratio of neighbor cell is relatively low The different spreading code sets of division distribution；

Effect of the invention is that：（1), there is provided a kind of new low phase pass of spread spectrum code word one/zero correlation spreading code set, this code word is divided into a different spreading code set, containing a different spread spectrum code word in each spreading code set, there is low phase pass/zero correlation characteristic between the code word of different code collections；(2), the group technology there is provided this kind of new spreading code set and coding method, including when domain structuring approach, frequency domain building method, code domain building method, time-frequency combination building method, time-code combined structure side

(3), there is provided a kind of new channel distribution based on low phase pass/zero correlation spreading code set, power distribution and cell/section network-building method；（4), in new channel distribution, power distribution and cell/section network-building method, spreading code set will be organized in each cell/section all with full, it is seen that the system of this new cell networking of application has very high capacity;(5), the invention provides a kind of special channel distribution, power distribution and cell/section network-building method, so that the adjacent cell interference of cellular mobile system and adjacent inter-sector interference are substantially reduced, also cause simultaneously whole system reached the state of a balance, the i.e. user of Intra-cell and cell boarder with being communicated per family with identical quality（Or the communication quality of each user is provided according to Qos difference）, there is unbalanced situation without traditional CDMA systems, the user of Intra-cell can communicate, and the user of cell boarder can not communicate, the communication system of this balance can provide the power system capacity of maximum；（6), above-mentioned channel distribution and power distribution are not only practically applicable to cell networking, equally applicable for Shan Qu Group nets and similar networking；

(7), above-mentioned channel distribution and power distribution are not only practically applicable to downlink, equally applicable for up-link；（8), the individual spread spectrum code word in each spreading code set can also use zero correlation window sequence using orthogonal sequence, if using common orthogonal sequence such as WALSH codes etc., although reducing adjacent cell interference, but due to ISI and MAI still very, so power system capacity is still unlikely to obtain big raising, if a spread spectrum code word uses zero correlation window sequence in each code collection, because the sequence elimination has eliminated ISI and MAI, and channel distribution, power distribution and the cell/fan that the present invention is provided District's groups network method greatly reduces ACI again, and power system capacity can be greatly improved.（9), in traditional dynamic channel allocation algorithm, if full user ' in working condition, dynamic channel allocation algorithm has just failed, and the channel distribution that the present invention is provided, power distribution algorithm is still effective in the situation of full user, so bigger capacity can be provided, traditional dynamic channel allocation is very limited amount of to the inhibitory action of interference in addition, and the channel distribution that the present invention is provided, power distribution algorithm can substantially reduce the adjacent cell interference of system, in addition traditional dynamic channel allocation algorithm is considerably complicated, need dynamically to carry out time slot switching, code channel switches and channel switch, and the channel distribution that the present invention is provided, power distribution algorithm is then very simple, switched over according only to the geographical position residing for user, it is the equal of static that it is actual.

Brief description of the drawings

Fig. 1 is that N number of time slot divides schematic diagram；

Fig. 2 is the N number of low phase pass of temporal partitioning/zero correlation spreading code set schematic diagram；

Fig. 3 is the division schematic diagram of three uncorrelated LS code collections;

Fig. 4 is arrangement schematic diagram of three spreading code sets in three cells；

Fig. 5 is that the adjacent cell interference of three kinds of schemes in embodiment is compared；

Fig. 6 is arrangement schematic diagram of 4 spreading code sets in three cells；

Fig. 7 is arrangement schematic diagram of three spreading code sets in 19 cells;

Fig. 8 is the schematic diagram of two sectors.

Embodiment

(one）, low phase pass/zero correlation spreading code set, i.e.,：The invention provides a kind of new low phase pass/zero correlation spreading code set and its group technology：

(1), assume there is a spread spectrum code word, wherein N can take arbitrary positive integer, and packet will be carried out on this basis；

(2), individual spreading code is grouped, the individual code collection of formed objects is divided into, is respectively labeled as SET, SET₂ SBT_PEach code collection has a code word, is respectively labeled as

C0DE、 CODE, C0DE_K.So it is in the code collection:Individual code word just can be with table Be shown as, SET_n, CODE,);

(3), packet is carried out according to following criterion：Packet makes have good correlation properties between different code collections as far as possible（Closed or zero correlation for low phase in time migration very big around the origin）There is good cross correlation between i.e. any two codes from different code collections, and the correlation properties between code in same code collection do not make special requirement, can be orthogonal sequences, can also be zero correlation window sequence, it might even be possible to be non-orthogonal sequences；

(4), by the above the step of we have been obtained for code collection, contain f code word in each code collection, wherein coming from has good correlation properties between the code word of different code collections, and does not have special requirement to the correlation properties between the code word inside code collection.

Above-mentioned low phase pass/zero correlation spreading code set and group technology is exemplified below.Provided with following 8 code lengths code word is spread for 8 complementation（With two complementary portions）, it is respectively：

c₁=(++++++~, +-+-+-+) c₂=(+"+--++++, +-++-+-)

c₃=(++++~++, +-+-++-) c₄=(++ ,+-+-+-+)

c₅=(+- +-+ ~+₅ ++++++--) c₆=(+._++_+-₅ ++__++++)

c₇=(+-+— ++-

c₈=(+--+-+-+, ++)

Code word above is divided into two groups by us： ^Ji ^ ^^ ) , SET₂ ={c₅,c₆,c₇,c_s)₀The code word in two spreading code sets after packet has the following properties that:The code word of same code collection has zero correlative window characteristic, and zero correlation window is（- 1,1), the cross-correlation between the code word in different code collections is zero in all time migrations, i.e., two code collections have preferable cross correlation.

Table 1 lists the correlation function of first code and other each yards

Table 1:The auto-correlation and cross-correlation function of code 1

IS

From table 1 it follows that code 1 has zero correlative window characteristic with the code word in code collection 1 (code 1, code 2, code 3, code 4), zero correlation window is（- 1,1), code 1 has preferable cross correlation with code collection 2 (code 5, code 6, code 7, code 8).Table 1 only lists the auto-correlation and cross-correlation function of code 1, and other yards have similar property with code 1.Packet above has obtained N=l code collection, and each code is concentrated between K=4 spreading code, two code collections having preferable cross correlation.

Any given above-mentioned individual spread spectrum code word, according to above-mentioned packet requirement by frequency spreading code division into Ν group be not an easily thing.But we can but construct above-mentioned low phase pass/zero correlation spreading code set by specific building method.Present invention also offers the building method of low phase pass/zero correlation spreading code set, domain structuring approach, frequency domain building method, code domain building method, time-frequency combination building method, time-code combined structure method, frequency code combined structure method and time-frequency code combined structure method when described building method includes.

Code domain building method, pass through special building method, a different code collection is distinguished from code domain, so that having good correlation properties between individual code collection, the low phase pass/zero correlation spreading code set distinguished below in code domain is referred to as code division low phase pass/zero correlation spreading code set.

Code domain building method comprises the following steps： ·

(1) a generalized complementary code with a complementary portion incoherent two-by-two, is constructed, the length of each complementary portion is L.(specific building method may refer to document [1,2,5])

The code word S that individual length is_1; S₂..., S^, except zero point, if the auto-correlation sum of individual code word is all zero on being offset, claims code word（S_l5 S₂..., S is the generalized complementary code with individual complementary portion.

If two generalized complementary codes with a complementary portion：（S ..., S), (Sj², S₂ ²..., s;), if the cross-correlation sum of individual complementary portion therebetween is equal in all time migrations It is zero, then claims the two generalized complementaries code uncorrelated.

For the generalized complementary code with individual complementary portion, there is following conclusion to set up：At most there are the N incoherent generalized complementary codes with a complementary portion two-by-two.（Referring to document [1,2,5]) this generalized complementary code is denoted as by we：（S, S₂, S), (S, S₂ ², S) ... ..., (S, S .., S).

When=2, above-mentioned code word is the mutual-complementing code often said, now at most there are two mutual incoherent complementary code words.When>When 2, above-mentioned code word is referred to as generalized complementary code, now at most there is a generalized complementary code incoherent two-by-two. .

When the length Z-1 of each complementary portion is special case situation, now individual generalized complementary code structure si s¹. '

Into matrix be actually orthogonal matrix, i.e. a matrix A=be an orthogonal matrix_c

^¾1 ^¾2 · " ^bN

Work as N, L takes smaller value, a generalized complementary code can be obtained by Computer Simulation search, works as N, when taking than larger value, can be obtained by certain building method (referring to document [1,2,5]).

(2) Γ χ Γ orthogonal matrix H Κ χ Κ, are chosen

(3) a generalized complementary code with a complementary portion incoherent two-by-two, is had been obtained for by two above step： (S , S₂S,（S, s₂ ², S) ... ..., (s, s ..,

S), code length is and x orthogonal matrix carries out the spreading code set that available one of Kronecker extensions extend for each generalized complementary code using orthogonal matrix 11^^, containing a spread spectrum code word in the spreading code set, specific extended mode is as follows：

SET_N= μ_ΚχΚ ®s_x ^N, u_KxK ®S₂w… H_KXK Wherein ', operation Kronecker operations are represented, such as：

For the spreading code set SET of each extension_n, 1 n N, its ^ " ", which goes, represents a code word extended, then each extended code is concentrated spreads a code word containing individual, and each spread spectrum code word has an individual complementary portion, and the individual spreading code set that the length of each complementary portion is changed into obtaining has following property：

(a), there is the zero correlation window of [- Z+l, Z- 1] for the individual spread spectrum code word in each spreading code set, i.e., interior Γ spread spectrum code word has preferable auto-correlation and cross-correlation in [- -1].If=1, f in each code collection after extension spreads code word and only keeps orthogonal.

(b), for different spreading code sets, in all time migrations, there is zero correlation characteristic between the code in two code collections.I.e. in [- 1, NL-1], the cross-correlation between code of any two from different code collections is zero.

(4) spreading code set, has been obtained by three above step, each code collection has f spreading code.Wherein coming from has zero correlation characteristic between the code word of different code collections, and to the code word inside code collection can be zero correlation window code word or general orthogonal code.The individual spreading code of above-mentioned generation is the generalized complementary code with a complementary portion, carries out requiring N number of complementary portion difference computing during correlation computations, it is impossible to overlapping.So in practice, individual complementary portion should be transmitted in the channel of individual synchronous fading.Individual complementary portion can be placed in a time slot and send by we, and protection interval is inserted between adjacent time-slots.The efficiency so done may not be very high.We even can by between middle # ^ families, though so ^^ horse ^) lose mesh and close spy f and give birth to, but still mesh pass characteristic.

Our for example bright marfan's methods, take the blue or green conditions of Please of 4, L=2, K=4 below.

(1) 4 incoherent generalized complementary codes with 4 complementary portions two-by-two, are constructed first, and code length is 2, such code word is provided here as follows（Specific configuration sees reference document 1,2,5):

(Si ^l, S₂', S₃ ^,, S4^l)= (++,++,+-,+-) (Si², S₂ ², S₃ ², S₄ ²) = (++,-,+-,- +)

(S,³, S₂ ³, S3³, S₄ ³)= (+-,+-,++,++) (S!⁴, S₂ ⁴, S3⁴, S₄ ⁴) = (+-,-+,++,-)

Table 2 lists code（SA S , S3¹, S) auto-correlation and cross-correlation function Code（S, S₂ S 3¹, auto-correlation s) and cross-correlation function

Table 2 only lists the auto-correlation and cross-correlation of first code, and the correlation of other yards is similar with code 1, i.e., with preferable auto-correlation and cross-correlation function.(2) 4x4 orthogonal matrix H, is chosen_4X4 = l l l

+

+ + + +

(3) one or four spreading code sets, can be obtained by above-mentioned Kronecker extensions：

SET :

code 1：+++ +++-, +++ +++-,+-+-+-+,+-+_+- -+

code 2:++-++++, ++-++++,+- ++ _+- ,+- ++ -+_

code 3: ++++—++, ++++—++, +-+—++-, +-+—++_

code 4:++, ++ ,+-+-+-+,+-+-+-+

SET₂

code 5:+++ +++-, ++ ,+-+-+-+, -+-+- ++-

code 6:++-++++, one ++-- ,+- ++ -+- ,-++ -+-+

code 7:++++- ++, ----++ -- ,+-+- ++-.+-++-+

code 8:++ ,-+++ +++ ,+-+-+-+,-++ -+-+-

SET₃:

code 9:+ -+-+-+,+-+-+-+, +++ +++-, +++ +++-

code 10:+ -- ++ -+- ,+- ++ -+-, ++ ++++,

code 11：+ -+- ++-,+-+- ++-, ++++- ++, ++++- ++

code 12:+ -+-+-+,+-+-+-+, ++, ++

SET,:

code 13:+ -+-+-+, -+-+- ++-, +++ Η+-, ++

code 14:+-++ -+- ,-+++-+, ++-++++,-++--

code 15:+ -+- ++-, -+- ++ -+,-- ++-code 16:+ --+-+-+,-++ -+-+-, ++ -- +++ +++ the auto-correlation and cross-correlation function of code 1 are listed in table 3 Table 3:The auto-correlation and cross-correlation function of code 1

Note：In above-mentioned correlation computations, four complementary portions mutually can not be overlapping.Each complementary portion can be placed on the channel of the non-overlapping copies with synchronous fading and sent in practice; by insertion protection interval between four mutually plain part and then it can for example send; even if but without protection interval, still there is low correlated characteristic between different code collections.

Table 3 only lists the auto-correlation and cross-correlation function of code 1, and other code words have similar property with code 1.As can be seen that the correlation function between code 1 and each yard of first spreading code set has zero correlative window characteristic from table 3, that is, exist（- 1,1) there are preferable correlation properties between the code in first code collection, and in all time migrations be zero correlation between the code word of code 1 and three other code collections.

Four spreading code sets of above-mentioned generation have the following properties that：Code word in same code collection exists（ - 1, 1 ) It is interior that there is zero correlation characteristic, and zero correlation characteristic is respectively provided with all time migrations between the code of different code collections.

In above-mentioned example, the code sequence in same code collection is zero correlation window sequence.Code sequence in other same code collection can also be that the code sequence in same code collection is orthogonal sequence in an orthogonal sequence, example below, and have zero correlation characteristic between different code collections.

Ζ=1 is taken ,=4 special case situation.

(1) 4 incoherent generalized complementary codes with 4 complementary portions two-by-two, are constructed first, and code length is 1, such code word is provided here as follows（Specific configuration sees reference document 5):

(S,¹, S₂ ^], Ss¹, S₄')= (+ ,+,+,-) (S,², S₂ ², S₃ ², S₄ ²) = (+,-,+,+)

(S,³, S₂ ³, S3³, S₄ ³)= (+ ,+,-,+) (β S₂ ⁴, S3⁴, S₄ ⁴) = (+,-,-,-)

Obviously four above-mentioned code words are mutually orthogonal.

(2) 4x4 orthogonal matrix H, is chosen_4X4

(3) four spreading code sets, can be obtained by above-mentioned Kronecker extensions：

SET :

code 1： +++-, +++-, +++-,— +

code 2: +-++, +-++, +-++, -+- code 3:++ -+, ++ -+, ++ -+, -+- code 4:+ ---, 4--- ,+--,-+++

SET₂:

code 5: +++-,—+, +++-, +++- code 6: + -++, -+--, + -++, +-++

code 7: ++-+, -+-, ++-+, ++- +

code 8: +—, -+++, +---, +—

SET₃:

code 9: +++-, +++-,— +, +++- code 10: + -++, +-++, -+--, +-++

code 11: ++-+, ++- +, -+-, ++- +

code 12: +— , +---, -+++, +—

SET^. '

code 13:+++-, ---+, -+, -+

code 14:+-++, -+--, -+--, -+-- code 15: ++-+, -+-, -+-, -+- code 16:+-,-+++, -+- H- ,-+++ the auto-correlation and cross-correlation function table 4 of code 1 are listed in table 4:The auto-correlation and cross-correlation function of code 1

As can be seen from Table 4, it is only orthogonal in origin holding between code 1 and other codes in first spreading code set, and there is preferable cross correlation with the code in other spreading code sets.

Two examples above illustrate how to obtain low phase pass/zero correlation spreading code set using code domain building method.Present invention additionally comprises any equivalent transformation of above-mentioned code collection.

When domain structuring approach, individual different code collection is made a distinction from time domain, the spreading code set thus generated is referred to as time-division low phase pass/zero correlation spreading code set.When domain structuring approach comprise the following steps：(1), l histories have f spread spectrum code word, and this spread spectrum code word can be zero correlation window code, also may be used To be general orthogonal code, it might even be possible to be non-orthogonal code.

(2) frame length, is divided into a different time slot, the width of each time slot is that insertion protection interval width is Δ between T, time slot, as shown in Figure 1.

(3) it is, a different spreading code sets by frequency spreading code division according to time slot, the time slot represents the spreading code set, now theAll spreading codes are sent in individual time slot, and anything is not sent then in other time slots.At this moment the individual spreading code set constructed is as shown in Figure 2：

(5), several steps have obtained the spreading code set of a low phase pass/zero correlation more than, and each spreading code set has a spreading code.

When domain structuring approach compared to code domain building method have some advantages：（The code word that domain structuring approach is constructed when a), has higher efficiency compared to code domain building method, because if the interval of each time slot is compared, and middle protection time slot is just smaller compared to the interval for sending information.And for code domain building method, it is required to insert protection interval in the middle of 〃 complementary portion, it is necessary to sacrifice more resources；（B), when domain structuring approach compared to code domain building method it is simpler plus, it is more flexible, for any spreading code, we can assign it to a different time slot to obtain a low phase pass/zero correlation spreading code set, for being all readily available for arbitrary integer, and for code domain building method just without so easy, for example when for odd number, a generalized complementary code with a complementary portion incoherent two-by-two can not be just found in two element field, so profit can not just construct Ν low phase pass/zero correlation spreading code set with the aforedescribed process. '

(6) when, described above in domain structuring approach, what individual time slot was sent is identical spreading code, actually when domain structuring approach in, each time slot can send f different spreading codes, as different time slots can send the conversion of f spreading code, entirely different individual spreading code is can even is that, the individual spreading code set being so divided into remains in that low phase pass/zero correlation characteristic.

Present invention includes the frequency domain building method of low phase pass/zero correlation spreading code set, frequency domain construction side The thought of method is will to take spreading code set of the frequency spreading code division into individual low phase pass/zero correlation from frequency domain, and the code collection thus generated is referred to as frequency division low phase pass/zero correlation spreading code set.Frequency domain building method comprises the following steps：

(1), assume there be Γ spread spectrum code word, be denoted as CODE, ... ..., C0DE, this spread spectrum code word can be zero correlation window code or general orthogonal code, it might even be possible to be non-orthogonal code；

(2) an incoherent carrier wave, is chosen： i, f₂... ...,

(3), if spread spectrum code word is modulated on above-mentioned individual incoherent carrier wave respectively, N incoherent spreading code sets are obtained： SET f.+ iCODE^ C0DE₂... ..., CODE^, SBT₂: f^iCODE^ C0DE₂... ..., CODE^ ... ..., SET. f_N+ {C0DE_x, C0D£₂... ..., C0DE

(4), obtained having individual spreading code in an incoherent spreading code set, each code collection by above step.Frequency division low phase pass/zero correlation spreading code set has advantages below：（A) it is modulated at due to individual spreading code set on different carrier waves, so spreading code set different in all time migrations is respectively provided with low correlated characteristic；(b) protection time slot need not be inserted for frequency division low phase pass/zero correlation spreading code set, so its effect will height compared to time-division spreading code set, code division spreading code set.But it is modulated at due to different spreading code sets on different carrier waves, altogether with individual carrier wave, the problem of running into actual applications in realization.

In addition to three kinds of above-mentioned building methods, present invention also offers the combined structure method of three of the above building method：Including time-frequency combination building method, time-code combined structure method, frequency code combined structure method and time-frequency code combined structure method.Close, common generation N groups low phase pass/zero correlation spreading code set.Building method comprises the following steps during the code that the present invention is provided： .

(1) the ^ spreading code sets with low phase pass/zero correlation, are constructed using above-mentioned code domain building method, A is respectively labeled as₁₅A₂... ...,, wherein containing Γ spreading code in each spreading code set.

(2), ^ above-mentioned spreading code set is regarded as an entirety, with reference to foregoing when domain structuring approach, Qi Fen Do are placed on₂Sent in individual time slot, can so obtain=><₂Individual low phase pass/zero correlation spreading code set, this spreading code set is not to be：

SET [SET time slots 2 ... the SET of time slot 1_NITime slot₂

SET_NI+L： A₂The SET of+time slot 1_N： A₂+ time slot 2 ... SET_1NI： A₂+ time slot N₂

SET_{NI__L)N2+L：The SET of+time slot 1_MNI+1：Aw ,+time slot 2 ... SET：+ time slot N₂

(3) a low phase pass/zero correlation spreading code set, is obtained by above step, wherein each spreading code set includes a spreading code.Close, common generation group low phase pass/zero correlation spreading code set.Building method comprises the following steps during the code that the present invention is provided：

(2) above-mentioned spreading code set, is modulated to ^ incoherent carrier wave/i ,/₂..., on ^, obtain

^ incoherent spreading code sets, be respectively： Α^Α + Ζ,, Α₂ =Α + /₂ , …… , Α_Ν< =A + f_N]

(3), by above-mentioned Ν_χIndividual spreading code set regards an entirety as, with reference to foregoing when domain structuring approach, is individually placed to₂Sent in individual time slot, can so obtain=^<₂Individual low phase pass/zero correlation spreading code set, this spreading code set is not to be： ,

SET,:Aj+1+time slot of time slot 2 ... SET_NI： k_x+ time slot Ν_τ

SET N, ₂+] A₂The SETN^ of+time slot 1： A₂+ time slot 2 ... SET_2N2： A₂+ time slot N..

SET_{N__L)NI+]：Aw, the SEH of+time slot 1₊₁：Aw ,+time slot 2 ... SET：+ time slot N₂

(4) a low phase pass/zero correlation spreading code set, is obtained by above step, wherein each spreading code set includes a spreading code.Close, common generation group low phase pass/zero correlation spreading code set.Building method comprises the following steps during the code that the present invention is provided： (1) the ^ spreading code sets with low phase pass/zero correlation, are constructed using above-mentioned code domain building method, A is respectively labeled as₁₃A₂... ..., A^, wherein containing a spreading code in each spreading code set.

(2), regard ^ above-mentioned spreading code set as an entirety, with reference to foregoing frequency domain building method, it is modulated to respectively in an incoherent carrier wave and sent, can so obtain=^ χ₂Individual low phase pass/zero correlation spreading code set, this spreading code set is not to be：

SET. A,+ /, SET,: Aj+ /₂ …… SET_Ni + f_Ni

^SETN₂+\ '■ A₂ + /】 SET_N2+2： A₂ + /₂ SET_2ff₂： A₂ + /w₂

(3) a low phase pass/zero correlation spreading code set, is obtained by above step, wherein each spreading code set includes a spreading code.

Present invention also offers a kind of united building method of time-frequency code, specific step is similar as the aforementioned, and cylinder is singly described as follows：For a spreading code set containing K spreading code, it is divided into respectively from code domain, time domain, frequency domain, ^, Λ ^ low phases pass/zero correlation spreading code set is joined together to can be obtained by Ν=Ν_ΧΝ₂Ν ^ fShi correlations/zero correlation spreading code set.

(two）, a kind of new channel distribution, power distribution and cell/section network-building method

Present invention includes a kind of channel distribution, power distribution and cell/section network-building method based on above-mentioned low phase pass/zero correlation spreading code set.This new channel distribution, power distribution and cell/Shan Qu Group network methods can effectively suppress the interference from adjacent cell and the interference from adjacent sector.This new channel distribution, power distribution and cell networking method comprise the following steps：

(1) a low phase pass/zero correlation spreading code set, is obtained by above-mentioned coding method； (2) each cell, is divided into a concentric ring, the size of concentric ring can be according to actual conditions (service distribution or the convenient consideration of design etc.）Depending on；

(3), above-mentioned each cell is divided into concentric ring is one of special case situation, in addition can also be using other division methods.A division can be such as determined according to path loss, situation about being disturbed and wanted to interfering signal ratio level etc..In addition other dividing modes be there is likely to be；

(4), obtained individual low phase pass/zero correlation spreading code set is separately dispensed on a ring, from inner ring to outer shroud, the arrangement mode of individual spreading code set is designated as

(5) power distribution, is carried out to the user of individual ring, power distribution is different in downlink and up-link.In the downlink, to follow power-balance criterion and power distribution is carried out to the user of each ring, user's path loss of outer shroud is big, distributes larger power, and user's path loss of inner ring is small, distributes less power.In the uplink, traditional power distribution is to follow the criterion of power-balance to carry out, that is the power of user's arrival base station is equal in synchronization, and in the present invention, it is desirable to the power that the user of inner ring reaches user's arrival base station of the power ratio outer shroud of base station is big." more 4 blue or green refined each Κ shields letter shield ^ an ancient type of spoons that can unite of true above and below work(^ S if entering ^（SIR) flat ^ then goes；

(6), in neighbor cell, spreading code set is from inner ring to outer shroud, it should the arrangement mode different from this cell is used, labeled as corpse₂, Λ, …….Under multiple cell network environment, the arrangement of the spreading code set of different districts should be carried out in accordance with following criterion：Neighbor cell outer shroud, which is tried one's best, distributes different spreading code sets, i.e., adjacent d, the user of area's outer shroud try one's best using the code word in different code collections.

In the downlink, as a result of above-mentioned new spread spectrum code word, there are good correlation properties between code word from different code collections, so interference very little between the user of neighbor cell outer shroud or not interfering with completely, the user of outer shroud is only disturbed by the inner ring user from neighbor cell, and transmit power of the user of inner ring itself is small, so greatly reducing adjacent cell interference for the user of outer shroud, and for the user of inner ring, it is influenceed by from neighbor cell outer shroud user, its adjacent cell interference can increase, but for the user of inner ring, adjacent base station distance for this cell base station is big, after path attenuation, disturb very little, so the user of inner ring in the same old way can be with normal work. In the uplink, if using traditional power distribution method, follow the power-balance criterion that user reaches base station, now the user of outer shroud distributes relatively high power, and user's distribution smaller power of inner ring, the power of outer shroud user and inner ring user are all equal when reaching base station by path attenuation.In such case, we analyze the interference that inner ring user and outer shroud user are subject to：For outer shroud user, the spreading code that the outer shroud user of neighbor cell uses has good correlation properties with it, so it is disturbed it is blunt it is small even without, the user for the simply neighbor cell inner ring disturbed it, and according to traditional power distribution criterion, user's transmit power of inner ring is small, so the adjacent cell interference suffered by outer shroud user is relatively small；And for inner ring user, outer shroud user of the interference from neighbor cell suffered by it, due to outer shroud user transmit power ^^ so neighbour suffered by inner ring user ' ", Qu Gan.

If from analysis above to up-link as can be seen that using traditional power distribution criterion, for the new channel distribution that the present invention is mentioned, the unbalanced phenomenon of interference can be produced（Because it uses power-balance criterion, it is uneven that interference imbalance is also equivalent to wanted to interfering signal ratio）.If overcoming this phenomenon, we introduce wanted to interfering signal ratio balance criterion in the uplink, it is easy to regard to solving this problem, that is, properly increase the transmission power of inner ring user so that the wanted to interfering signal ratio level of inner and outer ring user reaches the state of a balance.Now the transmission power of inner ring user is still smaller than outer shroud user, but difference is more much smaller than using power distribution criterion, advantage of this is that bringing substantially reducing for the dynamic range of the transmission power of uplink user, the adjacent cell interference of outer shroud user has been greatly reduced simultaneously, improves the wanted to interfering signal ratio level in up-link.

(7), above-mentioned channel distribution and power distribution are not only practically applicable to cell networking, equally applicable for sector networking and similar networking.

For any type of networking（Including cell networking, sector networking and cell/networking mixed networking etc.）, there is specifically retouching in unified determination division methods and power distribution strategies, downlink State as follows：（A) division, is determined first, and method is as follows：Identical power is all distributed in base station to all users, then investigates each cell（Or sector）Different zones wanted to interfering signal ratio level, according to the height of wanted to interfering signal ratio level by each cell（Or sector）It is divided into a different part；（B), individual spreading code set is assigned in a division, while ensureing the different spreading code sets of the relatively low division distribution of the wanted to interfering signal ratio of neighbor cell；（C), the user in the region relatively low to wanted to interfering signal ratio distributes larger power, and the user in the higher region of wanted to interfering signal ratio distributes less power, until user's wanted to interfering signal ratio level in all regions reaches unanimously.

Being described in detail below in up-link：（A) division, is determined first, and method is as follows：All mobile stations all distribute identical power, then investigate each cell（Or sector）Different zones user's wanted to interfering signal ratio level, according to the height of wanted to interfering signal ratio level by each cell（Or sector）It is divided into N different parts；（B), individual spreading code set is assigned in a division, while ensureing the different spreading code sets of the relatively low division distribution of the wanted to interfering signal ratio of neighbor cell；（C), the user in the region relatively low to wanted to interfering signal ratio distributes larger power, and the user in the higher region of wanted to interfering signal ratio distributes less power, until user's wanted to interfering signal ratio level in all regions reaches unanimously.

(8), above-mentioned channel distribution and power distribution are equally applicable in downlink, up-link;

(9), individual spread spectrum code word in each spreading code set can also use zero correlation window sequence using orthogonal sequence, if using common orthogonal sequence such as WALSH codes etc., although reducing adjacent cell interference, but because ISI and MAI are still very big, so power system capacity is still unlikely to obtain big raising, if f spread spectrum code word uses zero correlation window sequence in each code collection, because the sequence elimination has eliminated ISI and MAI, and the channel distribution that the present invention is provided, power distribution and cell/section network-building method greatly reduce ACI again, power system capacity can be greatly improved.

We just analyze the important meaning of foregoing channel distribution, power distribution and cell networking to reduction adjacent cell interference according to realistic model below：

We are come the situation for downlink of having a talk first.

We discuss that new channel distribution, power distribution and cell networking disturb the big advantages that reduction is brought to adjacent cell thousand by taking LAS-CDMA systems as an example.LAS-CDMA traditional networking is U+LS modes, I.e. the user of Intra-cell is distinguished by LS codes, and different cells is distinguished by LA codes.New networking mode, plus foregoing point loop technique, can be seen that new networking mode can substantially reduce adjacent cell and disturb on the basis of LA+LS by the comparison of both networking modes.

We take=3 by taking three cell patterns as an example.Each cell is divided into equidistant three rings：Inner ring, middle ring, outer shroud.We by when domain structuring approach obtain 3 orthogonal spreading code sets, 32 LS codes are included in each spreading code set, the length of each LS codes is 128, this 32 LS code divisions are fitted on to send on different time slots obtain 3 orthogonal spreading code set SET SET, SET.In simulations

The division of three spreading code sets is illustrated in fig. 3 shown below：

And distribution of three spreading code sets in three cells is as shown in Figure 4：

Due to the good correlation between different spreading code sets, so for the user in a code collection, the user that the interference suffered by it is concentrated essentially from other cell same codes.For the outer shroud user in first cell, the interference suffered by it comes from the inner ring user of second cell and the middle ring user of the 3rd cell；For the middle ring user in one cell of the mat woven of fine bamboo strips, the interference suffered by it comes from the outer shroud user of second cell and the inner ring user of the 3rd cell；For the inner ring user in first cell, the interference suffered by it comes from the middle ring user of second cell and the outer shroud user of the 3rd cell.The obviously interference very little suffered by outer shroud user.This is also what is set up for other two cells.

Fig. 5 lists the ACI of three kinds of different schemes comparison, scheme one：LA+LS, are not added with power distribution；Scheme two：LA+LS, power distribution；Scheme three：LA+LS, new networking plan（Three rings+power distribution）.It can be seen that the third scheme will be far superior to other two schemes, specifically compare and be shown in Table 6

Table 5 lists partial simulation condition. Table 5:Partial simulation parameter

Table 6:The adjacent cell interference of three kinds of schemes is compared

As can be seen from Table 6, in outer shroud, ACI levels about 17dB lower than scheme two, the about 22dB lower than scheme one of scheme three, in middle ring, the ACI levels about 3dB lower than scheme two of scheme three, It is about lower than scheme one⁸DB, in inner ring, ACI the levels about MB lower than scheme two, 7dB about lower than scheme one of scheme three.

From the analysis of Fig. 5 and table 6 as can be seen that new channel distribution, power distribution and the cell networking that the present invention is provided greatly reduce the ACI levels of system, the especially user in cell boarder, this exactly current other scheme is short of.

From Fig. 5 it can also be seen that the interference level for the user that new channel distribution, power distribution and cell networking scheme result in cell diverse location is inconsistent, ultimately result in that wanted to interfering signal ratio level is inconsistent, i.e. the horizontal highest of wanted to interfering signal ratio of the user of outer shroud.In practice, if power distribution criterion using wanted to interfering signal ratio balance criterion, it is possible to solve this problem.

Above-mentioned example is to list three cells, each small special circumstances for being distinguished into three rings, and the present invention, which is applied to any cell, each cell, in practice has a case that any divides.Fig. 6, which lists three cells, each cell, has a case that 4 divisions；Fig. 7 lists 19 cells, and each cell has a case that in 3 divisions, figure that A represents S T B and represents SET C and represents SET^

It is above-mentioned provide it is simply therein several than more typical example, in actual applications, new channel distribution, power distribution and the cell networking that the present invention is provided can be applied flexibly, and this is mainly reflected in：（1.), individual low phase pass/zero correlation spreading code set can be obtained with various ways, including time domain, code domain, frequency domain, time-frequency, code frequency, code when and time-code frequency etc.；（2), each cell can be divided into a different region according to different criterions, such as be lost by distance, by path, by the situation that is disturbed etc., final target is exactly to maximize wanted to interfering signal ratio, i.e. adjacent cell minimum interference；（3), spreading code set of the neighbor cell from inner ring to outer shroud has different arrangements, and this arrangement mode has flexibility, it then follows principle be not interfere with each other between the user for making cell boarder；（4), the mode of power distribution has flexible, it is possible to use power-balance criterion, can also use SIR balance criterions；（5), new channel distribution, power distribution and cell networking method are not only suitable for downlink, are also applied for up-link；(6), new channel distribution, power distribution and small, district's groups network method is not only suitable for cell networking, is also applied for sector networking and other similar networkings.

New channel distribution, power distribution and the cell networking method that the present invention is provided are applicable not only to cell Networking, is equally applicable to sector networking, and solve adjacent sector thousand disturb problem.Sector will be divided into the part of several non-overlapping copies first, the method of division is main to be determined according to situation about being disturbed, due to the interference maximum for the adjacent sector that sector borders are subject to, the adjacent sector interference that sector center section is received is minimum, it is possible to carry out following divide：One sector is divided into N different parts by sector borders to sector centers, then above-mentioned channel distribution, power distribution and cell networking method are that can be applicable to this many sector networkings.

Cite a plain example to illustrate the situation of many sector networkings below, the situation of two sectors as shown in Fig. 8：Each sector is divided into two parts, sector borders part and sector centers part by situation about being disturbed according to sector, then chooses spreading code set SET, SET that two low phases are closed.In sector 1, sector borders part uses SET sector centers part to use SET on the contrary in sector 1.What power distribution strategies were chosen so that, the user of sector borders distributes larger power, and the user of sector centers distributes less power, it is not interfere with each other between the user that external two sector borders can thus be accomplished, so it is greatly lowered the interference of sector borders user, and the user of sector centers, due to antenna directional angle, the interference being subject to also will not be very big.This addresses the problem the problem of two sector networkings.This new way is more more advantageous than traditional networking mode.

Above-mentioned example simply show the special case of two sectors, carry out networking if necessary to more sectors, it may be considered that each sector is divided into more parts from border to center, then carry out networking according to following criterion：The user on adjacent sectors border uses different spreading code sets as far as possible.

Channel distribution, power distribution and the cell networking method that the present invention is provided can be extended to the situation of cell/section mixed networking, be described in detail below：

(1) all base stations, are assumed initially that without using power distribution, all users use identical transmission power, and then just cell or sector are divided into a different part by the blunt size according to wanted to interfering signal ratio；

(2) spreading code set SET, the S T of a low phase pass/zero correlation, is constructed as the method previously described₂ SET_N。

(3), in each cell or sector, individual spreading code set is assigned to above-mentioned individual part according to different arrangement modes, distribution should be carried out according to transfers between divisions：In neighbor cell or sector mutually Thousand disturb the best part uses different spreading code sets as far as possible.

(4) power distribution, is carried out to individual different piece, power distribution criterion is as follows：Larger transmission power is distributed in the less part of wanted to interfering signal ratio under the conditions of power distribution is not added with, and the larger part of wanted to interfering signal ratio distributes less transmission power, the wanted to interfering signal ratio of all parts is reached balance.

Channel distribution, power distribution and the cell that the present invention is provided/Shan Qu Group network methods are applicable not only in downlink, are equally applicable in up-link, the specific implementation method of this method in the uplink：Under ^：

(1) all movement stations, are assumed initially that without using power distribution, all users use identical transmission power, and then just cell or sector are divided into a different part by the blunt size according to wanted to interfering signal ratio；

(2) spreading code set SET, SET of a low phase pass/zero correlation, is constructed as the method previously described₂、 ET

(3), in each cell or sector, individual spreading code set is assigned to above-mentioned N number of part according to different arrangement modes, distribution should be carried out according to transfers between divisions:The best part is interfered in neighbor cell or sector and uses different spreading code sets as far as possible.

(4) power distribution, is carried out to individual different piece, power distribution criterion is as follows:Larger transmission power is distributed in the less part of wanted to interfering signal ratio under the conditions of power distribution is not added with, and the larger part of wanted to interfering signal ratio distributes less transmission power, the wanted to interfering signal ratio of all parts is reached balance.

The main contributions of the present invention are a kind of new low phase pass of spread spectrum code word one/zero correlation spreading code set of offer and a kind of new channel distribution, power distribution and cell/section network-building method based on this code word, greatly reduce the interference of adjacent cell.

(1), there is provided a kind of new low phase pass of spread spectrum code word one/zero correlation spreading code set, this code word is divided into a different spreading code set, containing f different spread spectrum code words in each spreading code set, there is low phase pass/zero correlation characteristic between the code word of different code collections；

(2), above-mentioned individual low phase pass/zero correlation spreading code set can also have a different sizes, but typically conventional is a size identical spreading code set；

(3), the group technology there is provided this kind of new spreading code set and coding method, including when domain construction Method, frequency domain building method, code domain building method, time-frequency combination building method, time-code combined structure

(4), the equivalent transformation of low phase pass/zero correlation spreading code set that the present invention is provided also any code collection including above-mentioned generation；

(5), there is provided a kind of new channel distribution based on low phase pass/zero correlation spreading code set, power distribution and cell/section network-building method；

(6), in new channel distribution, power distribution and cell networking method, spreading code set will be organized all with full in each cell, it is seen that the system of this new cell networking of application has blunt high capacity；

(7), the invention provides a kind of special channel distribution and power distribution and cell/section network-building method, so that the adjacent cell interference of cellular mobile system and adjacent inter-sector interference are substantially reduced, also cause simultaneously whole system reached the state of a balance, the i.e. user of Intra-cell and cell boarder with being communicated per family with identical quality（Or the communication quality of each user is provided according to Qos difference）, there is unbalanced situation without traditional CDMA systems, the user of Intra-cell can communicate, and the user of cell boarder can not communicate, the communication system of this balance can provide the power system capacity of maximum；

(8), above-mentioned channel distribution and power distribution are not only practically applicable to cell networking, equally applicable for sector networking and similar networking；

(9), above-mentioned channel distribution and power distribution are not only practically applicable to downlink, equally applicable for up-link；

(10), individual spread spectrum code word in each spreading code set can also use zero correlation window sequence using orthogonal sequence, if using common orthogonal sequence such as WALSH codes etc., although reducing adjacent cell interference, but because ISI and MAI are still blunt big, so power system capacity is still unlikely to obtain big raising, if a spread spectrum code word uses zero correlation window sequence in each code collection, because the sequence elimination has eliminated ISI and MAI, and the channel distribution that the present invention is provided, power distribution and cell/Shan Qu Group network methods drop significantly again<ACI, power system capacity can be greatly improved. (11), in traditional dynamic channel allocation algorithm, if in full user working status, dynamic channel allocation algorithm has just failed, and the channel distribution that the present invention is provided, power distribution algorithm is still effective in the situation of full user, so bigger capacity can be provided, traditional dynamic channel allocation is very limited amount of to the inhibitory action of interference in addition, and the channel distribution that the present invention is provided, power distribution algorithm can substantially reduce the adjacent cell interference of system, in addition traditional dynamic channel allocation algorithm is considerably complicated, need dynamically to carry out time slot switching, code channel switches and channel switch, and the channel distribution that the present invention is provided, power distribution algorithm is then very simple, only just switched over according to the geographical position residing for user, it is the equal of static that it is actual.Bibliography：

[1] S. J. Xu, Y. Gao and D. B. Li, "A coding method to create general spread spectrum sequence with zero correlation window." PCT/CN02/00193, March 22, 2002.

[2] S. J. Xu, Y. Gao and D. B. Li, "A coding method to create mismatched spread spectrum sequence with zero correlation window." PCT/CN02/00194, March 22, 2002.

[3] S. J. Xu, R. Tamrakar, Y. Gao and D. B. Li, "A coding method to create spread spectrum sequence with group-wise zero correlation window", PCT/CN02/00238, April 5, 2002.

[4] D.B. Li, "A spread spectrum multiple access coding method with zero correlation window", application no. PCT/CN00/00028. 2000.

[5] P.Z. Fan and M. Darnell, Sequence Design for Communications Applications, John Wiley, RSP, 1996.

'

Claims

Claim

1. a kind of low phase pass/zero correlation spreading code set coding method, it is characterised in that：If one has NK spreading code, NK described spreading code is grouped, is divided into a code collection, each code collection containing a spreading code；

Wherein described packet meets following condition：There is low phase pass/zero correlation characteristic between individual code collection after packet.

2. according to the method described in claim 1, it is characterised in that between the individual code collection after described packet there is low phase pass/zero correlation characteristic to refer to：Cross-correlation function between spreading code of any two from different code collections is around origin than keeping low phase pass/zero correlation characteristic in larger time migration；And the code in same code collection can be：One orthogonal code collection, or a zero correlation window code collection, or a nonopiate code collection.

3. according to the method described in claim 1, it is characterised in that described that clothes spreading code progress packet is included：A different code collection is distinguished from code domain, is divided into a code division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between individual code collection.

4. according to the method described in claim 1, it is characterised in that described that the progress packet of individual spreading code is included：A different code collection is distinguished from time domain, is divided into a time-division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between N number of code collection.

5. according to the method described in claim 1, it is characterised in that described that the progress packet of individual spreading code is included：From frequency domain by frequency spreading code division into individual low phase pass/zero correlation spreading code set, i.e.,：It is divided into a frequency division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between individual code collection.

6. according to the method described in claim 1, it is characterised in that described that the progress packet of y r spreading codes is included：From code domain and time domain generation group low phase pass/zero correlation spreading code set jointly, i.e.,：It is divided into a code time-division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between individual code collection.

7. according to the method described in claim 1, it is characterised in that described that individual spreading code is entered Row packet includes：Generate ^ groups ^^ correlations/zero correlation spreading code set jointly from time-domain and frequency-domain, i.e.,：Frequency division low phase pass/zero correlation spreading code set when being divided into individual, so that having low phase pass/zero correlation correlation properties between individual code collection.

8. according to the method described in claim 1, it is characterised in that described that the progress packet of individual spreading code is included：From code domain and frequency domain generation group low phase pass/zero correlation spreading code set jointly, i.e.,：It is divided into a code frequency division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between individual code collection.

9. according to the method described in claim 1, it is characterised in that described that the progress packet of individual spreading code is included：From time domain, frequency domain and code domain generation group low phase pass/zero correlation spreading code set jointly, i.e.,：It is divided into a time-frequency code division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between individual code collection.

10. according to the method described in claim 1, it is characterised in that comprise the following steps：

Step 1: assume there is a spread spectrum code word, ' wherein J can take arbitrary positive integer, packet will be carried out on this basis；

Step 2: being grouped to individual spreading code, 〃 code collection of formed objects is divided into, SET, SET, SET is respectively labeled as_N, each code collection has K code word, Jiang Qi Fen Do labeled as CODE, C0DE_l C0DE_K, the/code word being so in the code collection can just be expressed as (SET_n, C0DE_k );

Bu Sudden tri-, packet are carried out according to following condition：Packet make to have between different code collections in time migration very big around origin closed for low phase or zero correlation correlation properties, there are the correlation properties of low phase pass or zero correlation between i.e. any two codes from different code collections, and the code in same code collection can be orthogonal sequence, can also be zero correlation window sequence or non-orthogonal sequences；

Step 4: by the above the step of obtained containing code word in individual code collection, each code collection.

11. method according to claim 10, it is characterised in that described to include to the progress packet of individual spreading code：A different code collection is distinguished from code domain, is divided into a code division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between individual code collection；It is specifically walked Suddenly include：

The individual generalized complementary code (Sj with a complementary portion incoherent two-by-two of construction¹, S^ ...,

S,（S , S₂ ²..., S) ..., (S, S .., S), the length of each complementary portion is L；

h^h\u\ ½½…… hh\\KK

Choose x orthogonal matrix Η_λ^ = … ；

_^hhKK\l ^llllKK22 ······ ^hhKKKK_

Carried out for each generalized complementary code using orthogonal matrix in the spreading code set that Kronecker extensions obtain an extension, the spreading code set containing a spread spectrum code word.N number of spreading code set can be produced altogether.

12. method according to claim 11, it is characterised in that described carry out Kronecker extensions comprise the following steps：

SET_X = μ_ΚχΚ ®s\, n_KxK ®s … ΊΪ_ΚχΚ ®s_N ^l )

SET₂ = {ί1χ_χΚ ®5]², Ή._ΚχΚ ®5₂ ··· Ή-ΚχΚ ®^SN)

h_uS h_l2S… h_1KS is wherein^s' operation Kronecker operations are represented, such as： ½S k₂₂S ■■■ h_2KS

H^®S:

½1^{S h}K2^S ■■■ ^hKK^SFor the spreading code set SET of each extension_n, 1 n N, its ^ ", which goes, represents a code word extended, then each extended code is concentrated containing f spread spectrum code word, and each spreading code word has a complementary portion, and the length of each complementary portion is changed into 2, and obtained individual spreading code set meets following condition：For the individual spread spectrum code word in each spreading code set have [- Z+1, Z- 1] zero correlation window, i.e., 1] in spread spectrum a code word have manage Caracal auto-correlation and cross-correlation；If Z=l, f spread spectrum code word in each code collection after extension only keeps orthogonal；

For different spreading code sets, in all time migrations, there is zero correlation characteristic, i.e., [mutual between-interior code of any two from different code collections between the code in two code collections Pass is zero. -

13. method according to claim 11, it is characterised in that the individual spreading code of generation is the generalized complementary code with a complementary portion, carries out requiring a complementary portion difference computing during correlation computations, it is to avoid overlapping.

14. method according to claim 13, it is characterised in that described individual complementary portion is transmitted in the channel of N number of synchronous fading；For example：# complementary portion can be placed in a time slot and sent, protection interval is inserted between adjacent time-slots.

15. the method according to claim 14, it is characterised in that can the protection interval described in centre is cancelled, although so losing zero correlation characteristic between code collection, but still keep low correlated characteristic.

16. method according to claim 10, it is characterised in that described to include to clothes spreading code progress packet：A different code collection is distinguished from time domain, is divided into a time-division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between individual code collection；Its specific steps includes：

Assuming that there is f spread spectrum code word, this spread spectrum code word can be zero correlation window code or general orthogonal code, it might even be possible to be non-orthogonal code;

One frame length is divided into a different time slot, the width of each time slot is that insertion protection interval width is Δ between T, time slot;

By frequency spreading code division it is a different spreading code sets according to time slot, the time slot represents theIndividual spreading code set, now sends all spreading codes in the time slot, and does not send anything then in other time slots；

In the individual spreading code set divided, time migration is in [- Δ, Δ] in, cross-correlation between two different spreading code sets is zero, even if time migration exceedes Δ, if the lap of two time slots is not 4 blunt big, two different spreading code sets remain in that ^ third constellations correlation properties；

The spreading code set of a low phase pass/zero correlation is obtained, each spreading code set has a spreading code.

17. the method according to claim 16, ' characterized in that,/What individual time slot was sent is identical spreading code.

18. the method according to claim 16, it is characterised in that each time slot of knife time slot can send f different spreading codes.

19. method according to claim 10, it is characterised in that described to include to the progress packet of individual spreading code：From frequency domain by frequency spreading code division into individual low phase pass/zero correlation spreading code set, i.e.,：It is divided into a frequency division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between individual code collection；Its Ju Ti Bu Sudden includes：

Assuming that there is Γ spread spectrum code word, CODE is denoted as, ... ..., C0DE, this K spread spectrum code word can be zero correlation window code or general orthogonal code, it might even be possible to be non-orthogonal code；

Choose an incoherent carrier wave： i , f₂... ..., f_N;

Individual spread spectrum code word is modulated on above-mentioned individual incoherent carrier wave respectively, an incoherent spreading code set is obtained： SET f^ {C0DE_x, CODE ..., C0DE, SET₂: f₂+ {C0DE_x, C0DE₂... ..., CODE } ... ..., SETfj. f_N+ {C0DE_x, C0DE₂, …… , CODE ；Obtain having Γ spreading code in an incoherent spreading code set, each code collection.

20. method according to claim 10, it is characterised in that described to include to the progress packet of individual spreading code：From code domain and time domain generation group low phase pass/zero correlation spreading code set jointly, i.e.,：It is divided into a code time-division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between individual code collection, its specific steps includes：

^ code division low phase pass/zero correlation spreading code set is constructed, is respectively labeled as ... ...,

A_Nl, wherein containing a spreading code in each spreading code set；

Regard ^ described code division spreading code set as an entirety, be individually placed to₂Sent in individual time slot, can so obtain=^x^ low phase pass/zero correlation spreading code set, this spreading code set is not to be：

SET+time slot 1, SETi. time slots 2 .., SET_Ni：+ time slot,

SET_{N +l}： A₂+ time slot 1, SET^₊₂：+ time slot 2 ..., SET_2Nl： A₂+ time slot N₂ , SET_N_,_)N2 Α_Νι+ time slot 1, SET_MN2+2：+ time slot 2 .., SET^：A^ ,+time slot W₂;Thus a 4 third constellations correlations/zero correlation spreading code set is obtained, wherein each spreading code set includes a spreading code.

21. method according to claim 10, it is characterised in that described to include to individual spreading code Jin Hang Fen Group：Generate groups low phase pass/zero correlation spreading code set jointly from time-domain and frequency-domain, i.e.,：Frequency division low phase pass/zero correlation spreading code set when being divided into individual, so that having low phase pass/zero correlation correlation properties between individual code collection, its specific steps includes：

Provided with a spreading code set, including f spreading code, A is designated as

Described spreading code set is modulated on ^ incoherent carrier waves, an incoherent spreading code set is obtained, is respectively： A A + yi, A₂ =A + /₂ , …… , Α^ =Α + /^ ;

Regard described individual spreading code set as an entirety, be individually placed to send in a time slot, can so obtain N=N^N₂Individual low phase pass/zero correlation spreading code set, this spreading code set is not to be：

SET,:Time slot 1, SET,:Time slot 2 ..., SET_Ni：Time slot

SET_Ni+l A₂+ time slot 1, SET_Ni+2： A₂+ time slot 2, " SET_2Nl： A₂+ time slot V₂,

SET_MN2+l：Aw ,+time slot 1, SET_MN2+2: A_N]+ time slot 2, SET_NxN2：Α+time slot N₂;Thus a low phase pass/zero correlation spreading code set is obtained, wherein each spreading code set includes a spreading code.

22. method according to claim 10, it is characterised in that described to include to the progress packet of individual spreading code：From code domain and frequency domain generation group low phase pass/zero correlation spreading code set jointly, i.e.,：It is divided into a code frequency division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between individual code collection, its Ju Ti Bu Sudden includes：

^ code division low phase pass/zero correlation spreading code set is constructed, A is respectively labeled as₁ A₂, ...... ,

A_N, wherein containing a spreading code in each spreading code set； Regard ^ described spreading code set as an entirety, it is modulated to respectively in an incoherent carrier wave and sent, can so obtain=χ₂Individual low phase pass/zero correlation spreading code set, this spreading code set is not to be：

SET_X: A, + _A, SET A, + /₂ , .·., SET_Ni： A,+ f_Ni,

SET_N2+： A₂ + _Λ , SET_N2+2： A₂ + /₂ ' … , SET_2N2： A₂ + f_Ni ,

^SET(N \)N₂+ '· ^AW, ⁺ /l ' ^SET{N \)N₂+2 · A.^ + f₂ , .·', SET_N[N2：⁺ /w₂;Thus a low phase pass/zero correlation spreading code set is obtained, wherein each spreading code set includes a spreading code.

23. method according to claim 10, it is characterised in that described to include to clothes spreading code progress packet：From time domain, frequency domain and the common Sheng Cheng Group low phases pass/zero correlation spreading code set of code domain, i.e.,：It is divided into a time-frequency code division low phase pass/zero correlation spreading code set, so that having low phase pass/zero correlation correlation properties between ^ code collection;Its Ju Ti Bu Sudden includes：

For a spreading code set containing spreading code, respectively from code domain, time domain, frequency domain by its point of N N₂,N₃Individual low phase pass/zero correlation spreading code set, is joined together to can be obtained by N=N_}N₂N₃Individual low phase pass/zero correlation spreading code set.

24. the method according to claim 1 or 10, it is characterised in that described to include to clothes spreading code progress packet：A spreading code set can be divided into domain generation group low phase pass/zero correlation spreading code set of multiple low phase pass/zero correlation spreading code sets from any.

25. the method according to claim 1 or 10, it is characterised in that described low phase pass/zero correlation spreading code set also includes：The equivalent transformation of any described low phase pass/zero correlation spreading code set.

26. a kind of low phase pass/zero correlation spreading code set application process, it is characterised in that comprise the following steps：Step 1: obtaining a low phase pass/zero correlation shield frequency code collection；

Step 2: being divided to each cell, it is divided into N number of nonoverlapping region；

Step 3: obtained individual low phase pass/zero correlation spreading code set Fen Do are assigned on a ring, from inner ring to outer shroud, the arrangement mode of individual spreading code set is designated as； Step 4: carrying out power distribution to the user of individual ring；

Step 5: in neighbor cell, spreading code set is from inner ring to outer shroud, using the arrangement mode different from this cell, labeled as Ρ_τ, Ρ ……。

27. the method according to claim 26, it is characterised in that described to include to the progress division of each cell：Each cell is divided into concentric ring, the size of concentric ring can be just blunt according to depending on the condition such as service distribution or design be convenient.

28. the method being confused according to claim 26, it is characterised in that described to include to the progress division of each cell：A division can be determined according to path loss, the size being disturbed, wanted to interfering signal ratio size；Described individual division can be irregular.

29. the method according to claim 28, it is characterised in that described can determine that Ν division includes according to wanted to interfering signal ratio size：In the downlink, all users are distributed to the wanted to interfering signal ratio level of different zones in identical transmission power, measurement cell first, different according to wanted to interfering signal ratio level by each small are distinguished into Ν nonoverlapping regions;In the uplink, first by all mobile station distribution identical transmission powers, the wanted to interfering signal ratio level of each user in base station is measured, different according to wanted to interfering signal ratio level by each small are distinguished into Ν nonoverlapping regions.

30. method according to claim 26, it is characterised in that the user to individual ring, which carries out power distribution, to be included：The power distribution in power distribution and up-link in downlink；Wherein：In the downlink, to follow power-balance criterion and power distribution is carried out to the user of each ring, user's path loss of outer shroud is big, distributes larger power, and user's path loss of inner ring is small, distributes less power；

In the uplink, the power of user's arrival base station of the power ratio outer shroud of user's arrival base station of inner ring is big.

31. the method being confused according to claim 26, it is characterised in that the user to individual ring, which carries out more accurate power distribution, to be included：Up-link is uniformly followed in wanted to interfering signal ratio balance criterion, i.e. up-link with downlink, and all users of base station end keep identical wanted to interfering signal ratio level, in descending chain 5^, and all mobile stations keep identical wanted to interfering signal ratio level.

32. method according to claim 26, it is characterised in that under many little Qu Group net environment, the arrangement of the spreading code set of different districts meets following condition：Neighbor cell outer shroud tries one's best the different spreading code set of distribution, the i.e. user of neighbor cell outer shroud as far as possible using the code word in different code collections.

33. the method according to claim 26, ' characterized in that, channel distribution and described power distribution are not only practically applicable to cell networking, it is equally applicable for sector networking and similar networking.

34. the method according to claim 26, it is characterised in that channel distribution and described power distribution are equally applicable in downlink, up-link.

35. the method according to claim 26, it is characterised in that the K in each spreading code set hands over sequence.

36. the method according to claim 26 or 33 or 34, it is characterised in that channel distribution and described power distribution are applied to cell networking, sector networking and other similar networkings, and are applicable in the downlink;It includes step in detail below:

A division is determined first, i.e.,：Identical power is all distributed in base station to all users, then the wanted to interfering signal ratio level of each cell or the different zones of sector is detected, each cell or sector are divided into a different parts according to the height of wanted to interfering signal ratio level, at the same can also other criterions determine N number of division； .

Individual spreading code set is assigned in a division, while ensureing the different spreading code sets of the relatively low division distribution of the wanted to interfering signal ratio of neighbor cell；

The user in the region relatively low to wanted to interfering signal ratio distributes larger power, and the user in the higher region of wanted to interfering signal ratio distributes less power, until user's wanted to interfering signal ratio level in all regions reaches unanimously.

37. the method according to claim 26 or 33 or 34, it is characterised in that channel distribution and described power distribution method are applied to cell networking, sector networking and other similar networkings, and are applicable in the uplink；It includes step in detail below：

A division is determined first, and method is as follows：All mobile stations all distribute identical power, user's wanted to interfering signal ratio level of each cell or the different zones of sector are then investigated, according to the height of wanted to interfering signal ratio level Each cell or sector be divided into the different parts of N, at the same can also other criterions determine N number of division；

Individual spreading code set is assigned in a division, while ensureing the different spreading code sets of the relatively low division distribution of the wanted to interfering signal ratio of neighbor cell；

The user in the region relatively low to wanted to interfering signal ratio distributes larger power, and the user in the higher region of wanted to interfering signal ratio distributes less power, until user's wanted to interfering signal ratio level in all regions reaches unanimously.